I'm not sure why it never occurred to me that you could do incremental flash loading using UF2 files. Seems relatively obvious since the file includes the load address, but I guess I've never had occasion to do it before.
In my previous blog RP2040 HDMI Display , I was trying out a bitbanged DVI interface. One of the examples "vista" is a full-res image viewer (project vista). When I tried the example, all I got was a white screen. I mentioned this to Luke Wren and he told me that the vista.uf2 file only loaded the viewer. I needed to load the image data file vista_data.uf2 which had been pre-built and was located in the "assets" directory with other pre-built image data. It makes sense that you might want to load the program and the data separately (or just update one piece).
I'm glad that Sparkfun added a Reset button to the carrier board. I hate the process of having to unplug and re-plug the microUSB connector to get the Pico into mass storage mode to load the UF2 files. It is still a two-handed process, you have to press and hold the Reset button, then the press and hold the Boot button, release the Reset button, and release the Boot button. Kinda clunky, but it beats wearing out the USB connector. I'll have to add a Reset switch to my Pico setup.
I had to get into the mass storage mode twice to load the two UF2 files. I wonder if there is a way not to reset the board after loading the UF2 file, i.e. leave it in mass storage mode. It would be nice not to have to do the button dance twice.
Anyway, the vista images are great.